I found a Hysol 9462 cartridge in the back of my shop refrigerator with an expiration date of 2010. I was reluctant to use it on my jets so I mixed some of it up for a deck project. There were some tiny lumps in the mixture but otherwise it seemed normal. Sure enough it hardened just fine.
I later took a closer look at the date and saw it had actually expired in 2000.....16 years ago! At $16 a cartridge I guess I won't worry so much any more if they are a little out of date, especially if they have been stored in refrigeration.
